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Part I. Vocabulary and Structure(30%): 1 who lays down his life for his country. A)There is no so greater love as that of a man B)There is no as greater love as that of a man
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1. To answer correctly is more important than () A. answered quickly B. a quick answer C. quickly answered D. to answer quickly 2.It ( until dark that he realized that it was too late to return home. A. is B. wasn't C. weren''td.were3. Do you remember() Tom about this before? A. to telling B. telling C. to have told D. tell 4. Look, () A. there he goes B. there goes he C. he goes there D. he there goes.It seems difficult () A. to stop the child to crying B. to stop the child of crying C. stopping the child cry D. to stop the child from crying 6.I have never drunk ( beer in my life. A. the better one B. more best C. more better D. better
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Test Paper One Part I Listening Comprehension (20 minutes) Section A Directions In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. both the conversation and the question will be spoken only once. After each question there will be a pause during the pause you must read the
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Economist.comSURVEYS The price of profligacy Sep 18th 2003 From The Economist print edition How bad is America's borrowing binge? \I JUST think it's a meaningless concept\That was the verdict of Paul O'Neill, George Bush's plain-spoken first Treasury secretary on the current-account deficit. Mr O'Neill reckoned it was silly to worry about external imbalances in a global economy where capital flows
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一、多媒体存储技术 二、多媒体功能卡 三、多媒体信息获取与显示设备 四、多媒体个人计算机 五、CD-I交互式多媒体系统 六、DVI多媒体计算机系统 七、VCD与DVD播放系统 八、多媒体工作站
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一维紧束缚近似下,晶体中电子在恒定电场作用下的运动规律一维紧束缚近似下:E'(k)=-J-2J cos ka--第i个能带
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I-1截面的静矩和形心位置 设任意形状截面如图所示。 1.静矩(或一次矩)
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Chapter 2 Northern ireland Time Allocation: 2 periods Focal Points: physical features of Northern Ireland, the religious conflicts between the irish and the british I. General Introduction When we talk about the United Kingdom, we cant neglect Northern Ireland. This part is the smallest part with an area of about 14, 160 square kilometers and a population of about
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1、单相半波可控整流电路对电感负载供电,L=20mH,U2=100,求当a=0°和60°时的负载电 流I,并画出ud与波形。 2、图1为具有变压器中心抽头的单相全波可控整流电路,问该变压器还有直流磁化问题吗?试 说明: ①晶闸管承受的最大正反向电压为22U2 ②当负载为电阻和电感时,其输出电压和电流的波形与单相全控时相同
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1.简述图1所示的降压斩波电路的工作原理。 2.在图1所示的降压斩波电路中,已知E=200V,R=10,L值极大,E=30V。采用脉宽调制控制方式,当T=50us,ton=20us时,计算输出电压平均值U、输出电流平均值I
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